Below are examples of Web 2.0 tools:
To insert them, copy the code and, in your wiki, select Widget, other HTML and paste the code. All done!
Brainstorming & mind
mapping online

Mindomo

Mind42

bubbl.us

wisemapping
Big Huge Labs

Create all sorts of image based work- Look for the Trading Card in particular
Word Clouds
Wordle

Tagxedo

Tagul - draw your own shape
Avatar Makers
Voki (talking)
Blabberize (talking)

Doppel Me

WImp Yourself

Lego Yourself - save with snipping tool

Manga maker
save with snipping tool

Mess Dudes
Video Slide Shows
Animoto

Slide Rocket

Photo Bucket

Kizoa
Sparkle text
Sparklee

Glitx

Textspace

Cool Text
Tuxpi

Online photo editor
Make wanted posters and all sorts of funky things
Animations
Page Plugins
Glogster

Create an online poster which can even include movies and audio
Fodey

All sorts of funky tricks with captions and there's a great place to write a newspaper article
Smilebox

Video slide shows
Xtimeline

Dipity

Tiki-toki

Create a timeline online that everyone can contribute to
Scribble Maps

Draw on google maps online and then download the image
Google Docs

Typewith.me

Share documents online
Poll Daddy

Insert a live voting form into your wiki or blog.


Surveys
Survey Monkey
Storybird

Zooburst

Make an online story book. Choose from amazing graphics

Myth Maker

Thing Link
Create an ebook (fact or fiction!)

Issuu

ePub Bud

Youblisher
Sumo Paint

Splashup

Images

And for people who want heaps of Web 2.0 choices to explore, have a look at:


Free software to use at home
Have a look at each site to see what the programs do
Pivot Stick Animator
Photoscape
Scratch
Photo Story 3
Gamemaker 8
Inkscape
Story Scrapbook